feat: fix tunnel

[tilschuenemann]

Related Issue or Design Document

#271

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Further comments

[tilschuenemann]

Running the tunnel now yields a correct response when using --dev mode:

[aeneasr]

Awesome! Could you fix this please too for

ory proxy \
		--project <your-project-slug> \
		http://localhost:3000 \
		https://example.org

I think the bug still exists there! You can tackle this as part of a new PR